Don’t Let Your Wheels Fall Off! VEX Collars & Spacers Don’t Let Your Wheels Fall Off!
Axles Don’t Stay Where You Put Them They can slide in TWO directions
Collars Attach to Axles Tighten the set screw to attach to a square shaft Use the small hex key. X
Use Collars Each collar stops the axle from sliding in one direction. Place one collar after the wheel or it will fall off!
Spacers
Spacers help keep gears and wheels in place.
Your Turn What happens to axles if you don’t use collars? How many ways do you need to stop an axle from sliding?
Resources Inventor’s Guide: 3·4